realslimshady
Contributing Member
"Hi all you knowledgeable ones
"Hi all you knowledgeable ones-bear with me, it's a bit of a saga, but I want to give you all the background.
Engine was seized-hadn't run for over two years.
Stripped the heads off-valves seized and 3 pushrods broken-heads were refurbished, oil left on top of pistons, then engine was eased over with plenty of oil on the bores and freed off.
Rebuilt the heads, overhauled all the valve lifters, engine reassembled.
Recon 2-barrel Rochester acquired as original had corroded beyond repair. Distributor overhauled with new points etc, new cap, leads and plugs.
So.....
fires and runs quite eagerly, but a bit lumpy, on opening the throttle, gets to about 2000 rpm and starts coughing and spitting making large 'sucking' noises from the carb....won't rev any faster, but happy to idle and run at lower revs.
Did a compression check today.
With the engine cold, had between 115 and 135psi on 7 cylinders, but only 60 on #4.Squirted some oil in there, ran the engine for 10 minutes or so, now have 120psi on #4...but symptoms are the same-won't go above 2k. Set ignition and timing again, no different.
My thoughts-
carb?
low compression (would it cause this?)
or-the spring on the (new) points seems very weak-could they be 'bouncing' at higher revs?
Anyone who's bothered to read this far got any thoughts?"
"Hi all you knowledgeable ones-bear with me, it's a bit of a saga, but I want to give you all the background.
Engine was seized-hadn't run for over two years.
Stripped the heads off-valves seized and 3 pushrods broken-heads were refurbished, oil left on top of pistons, then engine was eased over with plenty of oil on the bores and freed off.
Rebuilt the heads, overhauled all the valve lifters, engine reassembled.
Recon 2-barrel Rochester acquired as original had corroded beyond repair. Distributor overhauled with new points etc, new cap, leads and plugs.
So.....
fires and runs quite eagerly, but a bit lumpy, on opening the throttle, gets to about 2000 rpm and starts coughing and spitting making large 'sucking' noises from the carb....won't rev any faster, but happy to idle and run at lower revs.
Did a compression check today.
With the engine cold, had between 115 and 135psi on 7 cylinders, but only 60 on #4.Squirted some oil in there, ran the engine for 10 minutes or so, now have 120psi on #4...but symptoms are the same-won't go above 2k. Set ignition and timing again, no different.
My thoughts-
carb?
low compression (would it cause this?)
or-the spring on the (new) points seems very weak-could they be 'bouncing' at higher revs?
Anyone who's bothered to read this far got any thoughts?"
